Restructuring Charges (Schedule Of Accrued Restructuring Balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,336
Restructuring charges	4,693
Cash Payment	(4,728)
Non-Cash Activity	(21)
Foreign Exchange Adjustments	3
Ending Balance	1,283	$ 1,336
2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	4,607
Cash Payment	(3,303)
Non-Cash Activity	(21)
Foreign Exchange Adjustments	0
Ending Balance	1,283	0
2015 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,336	0
Restructuring charges	86	8,305
Cash Payment	(1,425)	(5,809)
Non-Cash Activity	0	(1,121)
Foreign Exchange Adjustments	3	(39)
Ending Balance	0	1,336
Severance [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	3,630
Cash Payment	(2,892)
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	738	0
Severance [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	222	0
Restructuring charges		2,542
Restructuring Reserve Accrual Adjustment	(1)
Cash Payment	(224)	(2,289)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	3	(31)
Ending Balance	0	222
Lease Facility Costs [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	0
Cash Payment	0
Non-Cash Activity	0
Foreign Exchange Adjustments	0
Ending Balance	0	0
Lease Facility Costs [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	928	0
Restructuring charges	109	2,462
Cash Payment	(1,037)	(1,534)
Non-Cash Activity	0	0
Foreign Exchange Adjustments	0	0
Ending Balance	0	928
Other Exit Costs [Member] | 2016 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	0
Restructuring charges	977
Cash Payment	(411)
Non-Cash Activity	(21)
Foreign Exchange Adjustments	0
Ending Balance	545	0
Other Exit Costs [Member] | 2015 [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	186	0
Restructuring charges		3,301
Restructuring Reserve Accrual Adjustment	(22)
Cash Payment	(164)	(1,986)
Non-Cash Activity	0	(1,121)
Foreign Exchange Adjustments	0	(8)
Ending Balance	$ 0	$ 186